Remove unneeded things
Eliminate _has_perm inconsistencies and cruft
Simplify has_*_perm functions and improve speed
Merge branch 'remove-cruft' of https://github.com/drkitty/cyder into drkitty-remove-cruft

Conflicts:
	cyder/cydhcp/interface/static_intr/models.py
Merge branch 'drkitty-remove-cruft'